Deontay Wilder believes a fight with Anthony Joshua to determine the undisputed heavyweight champion is inevitable.
Joshua was scheduled to defend his WBA, IBF, IBO and WBO titles against Jarrell Miller on June 1.
However, that contest has been thrown into doubt by the American returning an "adverse finding" in a test conducted last month by the Voluntary Anti-Doping Association (VADA). Miller denied any wrongdoing and has appealed against a decision to deny him a boxing licence.
Previous negotiations between the camps of Joshua and Wilder appeared tempestuous and did not result in an agreement.
But WBC champion Wilder is confident he and Joshua will eventually put everything on the line in a blockbuster bout.
"Believe me, this fight is going to happen," Wilder told Sky Sports. "There will come a day, a day real soon, when there can only be one.
"The heavyweight division belongs to me and I've known that for a very long time now, but I'm not satisfied with what I've achieved so far.
"I want every single belt, I want to be the undisputed champion, and I want the day to come when there can only be one king and that man will be Deontay Wilder.
"It's the fight that sets me apart from everybody else. I've fought and hurt every single person that's been in the ring with me and still they want questions answered.
"Bermane Stiverne, Alexander Povetkin, Luis Ortiz, and Tyson Fury. I took them all on and hurt them.
"I've proven time and time again that I will fight any heavyweight, but when it's as big as me and Joshua then it has to be right."
Wilder, who will fight Dominic Breazeale next month, appears to have put aside thoughts of a rematch with Tyson Fury following their thrilling draw in December.
"Fury don't want to fight me no more. He doesn't want to feel my power no more," he added.
"I'm learning this business as I go on and I know what me and Joshua means to the sport of boxing.
"The fight will happen one day, and you'll see that I was right all along when they give me my roses and I get to smell them."